SCOTTCHEN Diamond Flattening Stone Lapping Plate Double-sided Extra Large 10x3 inch (120&180) Grit Diamond Sharpening Plate Fixing Stone Flattener

Hefty 10" diamond plates stuck to a plastic form with magnets. The first time I took the plates off the form all 6 magnets came out attached to the back of one of the plates. A drop of super glue and replaced the magnets. Easy fix...I put these plates on a stone holder and flattened every stone I had. Lots of water and back and forth with a rotation of the stones every 10 passes. The plates flatten ceramic, silicone carbide, and natural stones (Japanese, Chinese, Arkansas and Vermont slate).Ran the stones over 120, and then 180... All stones were flat using straight edges. No light between straight edge and stone. I used other finer diamond plates ( much more expensive) to finish finer grit stones.These plates worked really well for rough flattening! And for 20 bucks, I'm not afraid to be rough with them. I rejuvenated several old oil stones with noticable dishing to flat and ready to work again. It would have cost me hundreds to replace my old dished stones...Cleanup was simple. You can use a small screwdriver, tip of a knife, or anything to get into the slots to pop off the plates from the form. Wipe any excess water off the plates and form and let dry before reassembling.I'm very happy with these plates. They do show some wear after I flattened 10 stones on both sides, but I honestly abused them pretty hard with those old oil stones. And they still have plenty of grit left and I'll use them for years to come.So if you have beat up old sharpening stones, these plates will bring them back to perfectly flat working condition again with a little elbow grease and water. Well worth 20 bucksUpdate:I really abused these plates... I flattened water stones super easy and the first couple oil stones I flattened had been soaked in degreaser for a couple days before I flattened them.......I started flattening oil stones without degreasing........They worked fine for a minute then clogged up with grease and oil... Black streaks throughout and just caked on there... Absolute mess!I sprayed a little WD and scrubbed them with Scotch Brite and the greasy build up came right off. I dried them and then scrubbed them with a little alcohol and they are clean and ready to work again. I'm pretty impressed with these diamond plates

The 150/400 for 20 bucks is unbeatable. I love my atoma plates but they are 50+ each (don't get me wrong they are absolutely worth the money) and for 20 bucks you get get one of these.This is a great stone for most people as the 150 cuts quick and removes material fast enough for reprofiling and fixing apex damage and the 400 leaves a nice aggressive toothy edge.Don't expect these to last a long time the diamond isn't bedded great in the 120, 150, 180 grits and they wear fairly quickly and loose their cutting power pretty quick. You might get 20 or 30 reprofilings off one of the courser grits but that's fair considering the price. The 400 and up the smaller diamond is bedded better and doesn't break loose as quickly as you would expect because they are smaller particles.Don't expect no super consistent scratch pattern as there are larger and smaller particles all over all the grits but it's good enough when you factor two decent stones that are flat for 20 bucks. The 400 leaves a scratch pattern that is close to a true 400g BUT you will have random deeper scratches in the pattern that are more like 220g. Again for basic at home edges it's good enough. The 1200 leaves a finish that is roughly the same as a shapton glass 1000 but you will have random deeper bigger scratches that are more like 600g.For decent, fast cutting, flat, solid diamond plates getting 2 grits for 20 bucks... these are unbeatable.To be completely honest these aren't far off of DMT Dia sharp plates.. the Dia sharp plates have slightly more consistent particle sizing (all diamond plates will leave random deeper and bigger scratches in the knife edges atoma is most consistent but all well do it to some extent) and will last slightly longer but at 50 bucks a stone I would take these over DMT any day of the week at less the half the price for a bigger stone and 2 grits instead of the diasharps one.If you want the best diamond plates get Atoma... if you want the best value these DMD plates are untouchable in price to performance ratio.

This is a large diamond stone (2 3/4" x 8" cutting surface). My last natural stone was about half the size and was a pain to sharpen longer knives with. It has a nice cradle (5 1/2" x 14") that does not rock or slide on the counter. Really like that it's three sided. The 150 grit really works great to get those really dull knives an edge fast and the 1200 grit polishes super sharp. I dinged it a star because it was supposed to come with an angle blade guide, which would be nice when you first start until muscle memory kicks in. Not sure how long the diamond surface will last as opposed to a natural stone but I can say that I've sharpened about 30 dull knives and about twenty five of those were basically useless except for warm butter. My neighbor borrowed and had it for a couple of days so I assume he did more than a few as well and I see no traces of any wear on any of the grits by keeping it wet.

Quick review- well worth the money, cuts fast and seems to hold up well.More in depth- I noticed several reviews saying that this is not flat. I would have to disagree, my experience with this proved otherwise. I dressed a few stones, they came out flat. I also surface ground, and lapped few A2 tooling blocks that were left over, then ran them on this diamond flattening stone, and the marks came out very flat.On to what I don't like- they way the stone is constructed. They have the plates set in a plastic base / form with gaps in between the stones to allow washout from what's being cut. I haven't really had any issues with this performance wise, so I'm not too bothered by it, but it is fairly cheaply made. That being said, I understand that they did it to keep cost down, so in respect to price, I have no real complaint here.

Does an excellent job of flattening my water stones

It’s 2 thin sheets of metal glued to plastic far from flat.

Great to sharpen larger kitchen knives

it works as stated

Used it to flatten my wet stone but has some imperfections that left big scratches to it